--- /dev/null
+From a949b090e9d4d11c300fb23b416a2cc69483962b Mon Sep 17 00:00:00 2001
+From: George Kiagiadakis <george.kiagiadakis@collabora.com>
+Date: Tue, 16 Feb 2021 17:26:20 +0200
+Subject: [PATCH] modules: add new access-seclabel module
+
+This module allows access control based on the security label
+of the client. It is tailored for use with the semantics of SMACK
+
+Upstream-Status: Inappropriate [smack specific]
+---
+ src/modules/meson.build | 10 ++
+ src/modules/module-access-seclabel.c | 220 +++++++++++++++++++++++++++
+ 2 files changed, 230 insertions(+)
+ create mode 100644 src/modules/module-access-seclabel.c
+
+diff --git a/src/modules/meson.build b/src/modules/meson.build
+index 8c9ccc85..234cff6b 100644
+--- a/src/modules/meson.build
++++ b/src/modules/meson.build
+@@ -14,6 +14,16 @@ pipewire_module_access = shared_library('pipewire-module-access', [ 'module-acce
+ dependencies : [mathlib, dl_lib, pipewire_dep],
+ )
+
++pipewire_module_access_seclabel = shared_library('pipewire-module-access-seclabel',
++ [ 'module-access-seclabel.c' ],
++ c_args : pipewire_module_c_args,
++ include_directories : [configinc, spa_inc],
++ install : true,
++ install_dir : modules_install_dir,
++ install_rpath: modules_install_dir,
++ dependencies : [mathlib, dl_lib, pipewire_dep],
++)
++
+ pipewire_module_profiler = shared_library('pipewire-module-profiler',
+ [ 'module-profiler.c',
+ 'module-profiler/protocol-native.c', ],
+diff --git a/src/modules/module-access-seclabel.c b/src/modules/module-access-seclabel.c
+new file mode 100644
+index 00000000..3739f2e4
+--- /dev/null
++++ b/src/modules/module-access-seclabel.c
+@@ -0,0 +1,220 @@
++/* PipeWire
++ *
++ * Copyright © 2018 Wim Taymans
++ * Copyright © 2021 Collabora Ltd.
++ * @author George Kiagiadakis <george.kiagiadakis@collabora.com>
++ *
++ * Permission is hereby granted, free of charge, to any person obtaining a
++ * copy of this software and associated documentation files (the "Software"),
++ * to deal in the Software without restriction, including without limitation
++ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
++ * and/or sell copies of the Software, and to permit persons to whom the
++ * Software is furnished to do so, subject to the following conditions:
++ *
++ * The above copyright notice and this permission notice (including the next
++ * paragraph) shall be included in all copies or substantial portions of the
++ * Software.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
++ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
++ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
++ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
++ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
++ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
++ * DEALINGS IN THE SOFTWARE.
++ */
++
++#include <string.h>
++#include <stdio.h>
++#include <errno.h>
++#include <sys/types.h>
++#include <sys/stat.h>
++#include <sys/vfs.h>
++#include <fcntl.h>
++#include <unistd.h>
++
++#include "config.h"
++
++#include <spa/utils/result.h>
++#include <spa/utils/json.h>
++
++#include <pipewire/impl.h>
++#include <pipewire/private.h>
++
++#define NAME "access-seclabel"
++
++#define MODULE_USAGE "[ seclabel.allowed=<cmd-line> ] " \
++ "[ seclabel.rejected=<cmd-line> ] " \
++ "[ seclabel.restricted=<cmd-line> ] " \
++
++static const struct spa_dict_item module_props[] = {
++ { PW_KEY_MODULE_AUTHOR, "George Kiagiadakis <george.kiagiadakis@collabora.com>" },
++ { PW_KEY_MODULE_DESCRIPTION, "Perform access check based on the security label" },
++ { PW_KEY_MODULE_USAGE, MODULE_USAGE },
++ { PW_KEY_MODULE_VERSION, PACKAGE_VERSION },
++};
++
++struct impl {
++ struct pw_context *context;
++ struct pw_properties *properties;
++
++ struct spa_hook context_listener;
++ struct spa_hook module_listener;
++};
++
++static int check_label(const char *label, const char *str)
++{
++ char key[1024];
++ int res = 0;
++ struct spa_json it[2];
++
++ spa_json_init(&it[0], str, strlen(str));
++ if ((res = spa_json_enter_array(&it[0], &it[1])) <= 0)
++ goto exit;
++
++ res = 0;
++ while (spa_json_get_string(&it[1], key, sizeof(key)) > 0) {
++ if (strcmp(label, key) == 0) {
++ res = 1;
++ break;
++ }
++ }
++exit:
++ return res;
++}
++
++static void
++context_check_access(void *data, struct pw_impl_client *client)
++{
++ struct impl *impl = data;
++ struct pw_permission permissions[1];
++ struct spa_dict_item items[2];
++ const struct pw_properties *props;
++ const char *str, *access, *label = NULL;
++ int res;
++
++ if ((props = pw_impl_client_get_properties(client)) != NULL) {
++ if ((str = pw_properties_get(props, PW_KEY_ACCESS)) != NULL) {
++ pw_log_info(NAME " client %p: has already access: '%s'", client, str);
++ return;
++ }
++ label = pw_properties_get(props, PW_KEY_SEC_LABEL);
++ }
++
++ if (!label) {
++ pw_log_info(NAME " client %p: has no security label", client);
++ return;
++ }
++
++ if (impl->properties && (str = pw_properties_get(impl->properties, "seclabel.allowed")) != NULL) {
++ res = check_label(label, str);
++ if (res < 0) {
++ pw_log_warn(NAME" %p: client %p allowed check failed: %s",
++ impl, client, spa_strerror(res));
++ } else if (res > 0) {
++ access = "allowed";
++ goto granted;
++ }
++ }
++
++ if (impl->properties && (str = pw_properties_get(impl->properties, "seclabel.rejected")) != NULL) {
++ res = check_label(label, str);
++ if (res < 0) {
++ pw_log_warn(NAME" %p: client %p rejected check failed: %s",
++ impl, client, spa_strerror(res));
++ } else if (res > 0) {
++ res = -EACCES;
++ access = "rejected";
++ goto rejected;
++ }
++ }
++
++ if (impl->properties && (str = pw_properties_get(impl->properties, "seclabel.restricted")) != NULL) {
++ res = check_label(label, str);
++ if (res < 0) {
++ pw_log_warn(NAME" %p: client %p restricted check failed: %s",
++ impl, client, spa_strerror(res));
++ }
++ else if (res > 0) {
++ pw_log_debug(NAME" %p: restricted client %p added", impl, client);
++ access = "restricted";
++ goto wait_permissions;
++ }
++ }
++
++ return;
++
++granted:
++ pw_log_info(NAME" %p: client %p '%s' access granted", impl, client, access);
++ items[0] = SPA_DICT_ITEM_INIT(PW_KEY_ACCESS, access);
++ pw_impl_client_update_properties(client, &SPA_DICT_INIT(items, 1));
++
++ permissions[0] = PW_PERMISSION_INIT(PW_ID_ANY, PW_PERM_ALL);
++ pw_impl_client_update_permissions(client, 1, permissions);
++ return;
++
++wait_permissions:
++ pw_log_info(NAME " %p: client %p wait for '%s' permissions",
++ impl, client, access);
++ items[0] = SPA_DICT_ITEM_INIT(PW_KEY_ACCESS, access);
++ pw_impl_client_update_properties(client, &SPA_DICT_INIT(items, 1));
++ return;
++
++rejected:
++ pw_resource_error(pw_impl_client_get_core_resource(client), res, access);
++ items[0] = SPA_DICT_ITEM_INIT(PW_KEY_ACCESS, access);
++ pw_impl_client_update_properties(client, &SPA_DICT_INIT(items, 1));
++ return;
++}
++
++static const struct pw_context_events context_events = {
++ PW_VERSION_CONTEXT_EVENTS,
++ .check_access = context_check_access,
++};
++
++static void module_destroy(void *data)
++{
++ struct impl *impl = data;
++
++ spa_hook_remove(&impl->context_listener);
++ spa_hook_remove(&impl->module_listener);
++
++ if (impl->properties)
++ pw_properties_free(impl->properties);
++
++ free(impl);
++}
++
++static const struct pw_impl_module_events module_events = {
++ PW_VERSION_IMPL_MODULE_EVENTS,
++ .destroy = module_destroy,
++};
++
++SPA_EXPORT
++int pipewire__module_init(struct pw_impl_module *module, const char *args)
++{
++ struct pw_context *context = pw_impl_module_get_context(module);
++ struct pw_properties *props;
++ struct impl *impl;
++
++ impl = calloc(1, sizeof(struct impl));
++ if (impl == NULL)
++ return -errno;
++
++ pw_log_debug(NAME" module %p: new %s", impl, args);
++
++ if (args)
++ props = pw_properties_new_string(args);
++ else
++ props = NULL;
++
++ impl->context = context;
++ impl->properties = props;
++
++ pw_context_add_listener(context, &impl->context_listener, &context_events, impl);
++ pw_impl_module_add_listener(module, &impl->module_listener, &module_events, impl);
++
++ pw_impl_module_update_properties(module, &SPA_DICT_INIT_ARRAY(module_props));
++
++ return 0;
++}
+--
+2.30.0
+
Code Review / AGL / meta-agl.git / blobdiff